摘要
Aluminum alloy is used as the support of final optical assembly because of its excellent mechanical properties,which constitutes th e“skeleton”of high-power laser system.Stray light reflected by weak optical elements in high power laser system will fall on the inner wall frame of aluminum alloy,which will cause damage and produce impurity particles,polluting the entire optical system.However,the research on the damage mechanism and protection technology of aluminum alloy under the action of high-power laser system is still in the initial stage.This paper introduces the interaction mechanism between laser and materials,analyzes the laser damage mechanism of aluminum alloy from the perspective of plasma nano metal particle ablation,reviews the progress of laser-induced damage protection of aluminum alloy,and prospects the future research direction of laser absorption and damage protection technology of aluminum alloy under the action of high-energy laser.
铝合金因其优秀的力学性能而被用作终端光学组件的支撑件,构成了高功率激光系统的“骨架”。在高功率激光系统中,光学元件反射的微弱杂散光会落在铝合金的内壁框架上,造成损坏并产生污染物颗粒,污染整个光学系统,落在光学元件表面,影响光的传输,导致光学元件损坏并造成二次损伤。然而,对于铝合金在高功率激光系统作用下的损伤研究仅局限于缺陷诱导电场增强激光损伤或热诱导损伤,而对于激光损伤防护技术的研究,往往采用表面改性技术,通过提高反射率或者是透射率降低激光能量的吸收沉积。本文介绍了激光与材料的相互作用机理,从等离子体纳米金属颗粒烧蚀的角度分析了铝合金的激光诱导损伤机理;此外,综述了铝合金激光损伤防护的进展,介绍了采用阳极氧化方法在生长出的周期阵列结构中添加硒化镉纳米吸光粒子,最后用二氧化硅封孔,在提高铝合金表面激光吸收的同时,具有良好的抗激光损伤能力。最后,展望了高能激光作用下铝合金激光吸收与损伤防护技术的未来研究方向。
基金
Project(AUGA5630112723)supported by the Assistant Professor Research Initiation Project of Harbin Institute of Technology,China。
